<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container{
            display: flex;
            flex-direction: row;
            justify-content: space-around;
            background-color: yellow;
            width: 800px;
            height: 300px;
            /* align-items:center; */
            /* flex-grow: inherit; */
        }
        .item{
            /* width: 100px; */
            /* height: 100px; */
            background-color: red;
            border: 1px black solid;
            /* flex-grow: 1; */
            width: 300px;
            flex: 1;
        }
        .big{
            /* width: 600px;    */
            height: 100px;
            flex: 2;
            align-self: center;
            /* flex-shrink: 2; */
            /* flex-basis: 200px; */
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="item">123</div>
        <div class="item">456</div>
        <div class="item big">789</div>
        <div class="item">789</div>
        <div class="item">789</div>
    </div>
</body>
</html>